1. Nikol’skiĭ N. K., “Invariant subspaces in operator theory and function theory,” in: Mathematical Analysis. Vol. 12 [in Russian], VINITI, Moscow, 1974, pp. 199–412 (Itogi Nauki i Tekhniki).
2. Nikolskii N. K., Operators, Functions and Systems: An Easy Reading. Vol. 1, Amer. Math. Soc., Providence (2001) (Math. Surveys and Monographs; 92).
3. Havin V. P., “Methods and structure of commutative harmonic analysis,” in: Contemporary Problems of Mathematics. Fundamental Trends [in Russian], VINITI, Moscow, 1987, 15, pp. 12–131 (Itogi Nauki i Tekhniki).
4. Keldysh M. V., “Sur l’appraximation en moyenne par polynomes des functions d’une variable complexe,” Mat. Sb., 16, No. 1, 1–20 (1945).
5. Mergelyan S. N., “Weighted approximation by polynomials,” Uspekhi Mat. Nauk, 9, No. 5, 107–152 (1956).